I owned the "broker FTP" service at a hedge fund.

There was a project in 2021 to talk to the banks and brokers that we connected and ask them to upgrade their keys and ciphers to modern versions.

IIRC, the oldest key/cipher was from the late 2000s so it wouldn't surprise me if someone is using RSA keys from the 90s somewhere.

You can read more about how hedge funds use FTP here: https://x.com/alexpotato/status/1809579426687983657?s=20

Or listen to patio11 and I talk about these systems in general here: https://www.complexsystemspodcast.com/episodes/two-banks-can...